Keystones — Lintel
Five GCSE retrieval questions · 24 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 400,000,000 in standard form
Answer: 4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.62cm -
4. Ratio Mixed ratio problems
Simplify: 12:9:9
Answer: 4:3:3 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 38, 30, 36, what is the missing number?
Answer: 48